CVE-2026-37461: An out-of-bounds read in the ParseIP6Extended function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers to cause

Routine

HIGH 7.5REMOTEDOWNGRADE

CVE-2026-37461 is a high-severity flaw (CVSS 7.5) affecting gobgp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An out-of-bounds read in the ParseIP6Extended function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted BGP UPDATE message.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 73%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-05-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: osrg

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-04 17:16 UTCPublished CVE record published
2026-06-17 10:41 UTCUpdated Record last modified

osrg gobgp DOWNGRADE

Affected: 4.3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.3.0

1. Check installed version

apt-cache policy gobgp || rpm -q gobgp || gobgp --version

2. No fixed release: DOWNGRADE to a release before 4.3.0 (Debian / Ubuntu)

apt-cache madison gobgp sudo apt install gobgp=<VERSION_BEFORE_4.3.0> sudo apt-mark hold gobgp

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list gobgp sudo dnf downgrade gobgp-<VERSION_BEFORE_4.3.0> sudo dnf versionlock add gobgp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-37461?

gobgp: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-37461 being exploited?

CVE-2026-37461 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-37461 affect?

CVE-2026-37461 affects gobgp. Severity is high (CVSS 7.5). An out-of-bounds read in the ParseIP6Extended function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted BGP UPDATE message.

How urgent is CVE-2026-37461?

Priority 38/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-41642 HIGH 7.5 DOWNGRADE GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language
CVE-2026-42285 HIGH 7.5 DOWNGRADE GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language
CVE-2026-41643 HIGH 7.5 UPGRADE GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language
CVE-2026-7736 HIGH 7.3 UPGRADE A vulnerability was determined in osrg GoBGP up to 4.3.0
CVE-2026-7735 HIGH 7.3 UPGRADE A vulnerability was found in osrg GoBGP up to 4.3.0

References

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